Your contributions are set by the LGPS regulations and are deducted from your gross pay by your employer, thereby reducing your taxable pay.
What you pay (calculator opens in a new window) depends on your pensionable pay.
In return for your contributions, you are provided with death in service benefits and the promise of a pension of 1/49th of your pensionable pay being paid to you for life from your State Pension age (calculator opens in a new window).